White House senior adviser Jared Kushner had omitted the June 2016 meeting from his security clearance form, but added it June 21. (AP Photo/Andrew Harnik)

President Trump's legal team knew more than three weeks ago about the email chain that shows Donald Trump Jr. accepting an offer to attend a meeting with a Russian lawyer promising information damaging to Hillary Clinton, according to a report Thursday.

Yahoo News, citing two sources familiar with the matter, reported that Marc Kasowitz, the president's lead lawyer in the Russia investigations, and Alan Garten, executive vice president and chief legal officer of the Trump Organization, were both informed about the emails in the third week of June, after they were discovered by lawyers for Jared Kushner.

Kushner, Trump's son in-law and senior adviser, initially omitted the meeting with the Russia attorney on his security clearance form, but later amended it on June 21.

On Tuesday, The New York Times obtained and published an email chain in which Trump Jr. accepted the meeting with the Russian attorney, Natalia Veselnitskaya. Trump Jr. also published the emails himself on his Twitter feed after being told the Times planned to reveal them.

Kushner and Paul Manafort, the president's former campaign chairman, joined Trump Jr. at the June 9, 2016, meeting.

Trump told Reuters in an interview on Wednesday that he learned just "a couple of days ago" of the meeting. On Thursday, he repeated that claim to reporters on Air Force One on the way to Paris, saying "I only heard about it two or three days ago."

It's unclear if Trump's attorneys attempted to inform the president about the meeting when they learned about it last month.

A spokesman for Kasowitz declined to comment to Yahoo News, saying the matter involved "privileged information." Garten did not respond to a request for comment either.

Kasowitz has become the subject of ridicule after ProPublica reported Thursday that he used profanities to lash out at a stranger who in an email urged him to resign.

A spokesperson for Kasowitz issued a statement acknowledging that Kasowitz wrote threatening emails and plans to apologize to the recipient.